Resolves#2815
* Gets or sets the number of tabs that should be retained to either side of the current tab in the view hierarchy in an idle state.
* Tabs beyond this limit will be recreated from the TabView when needed.
Add alignSelf nad flexWrapBefore in the flexbox examples
Some test fail with quite close calculations. Use eps.
Fix flex grow making last items with flexGrow 0 to shrink due to rounding, happy tslint
Items now appear, but they should initially shrink and they don't
Add 15-ish tests for flexbox layout
Port reasonable flexbox test set
Fixing issues, adding unit tests
Moved from .tsx to .ts and used our ui/builder.parse
* Change image.android to use the new image.Cahce class from widgets.
* fix npm scripts
* npm tsc will compile all so no need for npm run dev-tsc-tests
* fix tslint error
* image-tests use memory only cache.
* fix exception in image.android
* Change image-tests so that Image won't be GC immediately.
* Change cacheMode to enum
Less than 30 erros left, let's hope it still works
Added lib.*.d.ts from typescript, removed lib and dom stuff, added by hand XHR, alert etc. .d.ts-es for polyfills
Roll back some changes involved in separating UIEvent for dom and ios
Test combined dts-es will now use lib, while internally we will not to avoid UIEvent conflict with dom stuff
* Fix unit-tests checks.
LetterSpacing handlers are added for iOS and Android API 21+
* Removed unneded check for android
* Used parseInt instead of new Number due to TSLint error
Split type.class from CssTypeSelector to CssCompositeSelector, probably support type#id.class selectors
Apply review comments, refactor css-selectors internally
Applied refactoring, all tests pass, button does not notify changes
Add tests for the css selectors parser.
Added tests for css-selectors
Added basic implementation of mayMatch and changeMap for css match state
Implemented TKUnit.assertDeepEqual to check key and key/values in Map and Set
Watch for property and pseudoClass changes
Add one child group test
Add typings for animations
Added mechanism to enable/disable listeners for pseudo classes
Count listeners instead of checking handlers, reverse subscription and unsubscription
